The masterplan studies the area between the city of Barcelona, the airport and El Prat with its industrial area constrained by motorways, railways, metro lines and the river. The land between the city and the North border has been cut off by the viability system making it difficult to access just via a single point. The project wants to fuse the new development with the 19th Century fabric of the old city by putting roads and rail links underground and designing a new seventy hectares metropolitan park connected to the riverbed of the Llobregat and the river delta landscape. The program includes office buildings, business and commercial spaces, sport facilities, and five thousand homes. The apartments organized in urban blocks have green spaces in the courtyards and energy generating solar panels, for heating and cooling, on the roofs. It is a large-scale project with a plan implemented in phases from twenty to thirty years’ time aiming to straighten the metropolitan area, absorb all the infrastructures, give back visibility to El Prat city landscape, and to create a new park at the South entrance of Barcelona.